$long:1.1;
.main{
    width: 1000px*$long;
    height: 500px*$long;
    margin: 0 auto;
    background: rgba(0,0,0,.4);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    img{
        width: 300px;
        height: 300px;
    }
    span{
        font-size: 20px;
        margin-top: 10px;
    }
}